PARTICLE CLUMPING AND PLANETESIMAL FORMATION DEPEND STRONGLY ON METALLICITY
نویسندگان
چکیده
منابع مشابه
Particle Clumping and Planetesimal Formation Depend Strongly on Metallicity
We present three-dimensional numerical simulations of particle clumping and planetesimal formation in protoplanetary disks with varying amounts of solid material. As centimeter-size pebbles settle to the midplane, turbulence develops through vertical shearing and streaming instabilities. We find that when the pebbleto-gas column density ratio is 0.01, corresponding roughly to solar metallicity,...
متن کاملParticle Clumping in Protoplanetary Disks Depends Strongly on Metallicity
We present three-dimensional numerical simulations of particle clumping and planetesimal formation in protoplanetary disks with varying amounts of solid material. As centimeter-size pebbles settle to the midplane, turbulence develops through vertical shearing and streaming instabilities. We find that when the pebbleto-gas column density ratio is 0.01, corresponding roughly to solar metallicity,...
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Proposed mechanisms for the formation of km-sized solid planetesimals face long-standing difficulties. Robust sticking mechanisms that would produce planetesimals by coagulation alone remain elusive. The gravitational collapse of smaller solids into planetesimals is opposed by stirring from turbulent gas. This proceeding describes recent works showing that “particle feedback,” the back-reaction...
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The formation of planetesimals is investigated by studying the transport of dust particles in a local threedimensional simulation of accretion disc turbulence. Heavy particles fall rapidly towards themidplane,whereas lighter particles are strongly advected by the flow. For light particles the turbulence leads to a rapid redistribution of particles such that their density per unit mass is approx...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2009
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/704/2/l75